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Windows 7: External HDD not recognized ...

This problem of mine is somehow unique, as I didn't find anything on the web that solves this.

Recently I've upgraded from WinXP to Win7 ultimate. I have in my possession an external Verbatim HDD (500GB) that I use to backup my stuff.

When connecting the HDD the device is installed and you can see it in "My Computer" with the other drives.
After about 20 seconds, or when I try to copy data into the HDD, windows says "USB Device Not Recognized" and stopps displaying it as a drive.
In the Device Manager, I get the "Unknown Device" in the relevant USB port. Surely, I used all my ports to verify this issue.

As it appears, this only happens in Win7, not in previous versions of windows.

External HDD not recognized ...

External usb hd not recognizedWindows 7 pro won't recognize my external HD.
I have 2 external HDs which I rotate each month.
The computer as few days ago recognized the external
HD. When I use the 2nd External HD the computer
refuses to recognize it. The hds are used in a
Thermaltake Black X docker.
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General Discussion

help: external hd not recognizedsorry for my English. I'm asking for help for a problem: windows 7 does not recognize an external HD; I do not see it in "computers" but in "devices and printers". What should I do? Can you help me?
Tnx
Karla

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